.main{
    display: flex;
    >div{
        position: relative;
        flex: 1;
        min-height: 200px;
        border: 1px solid red;
    }
    .demo1{
        .demo{
            position: absolute;
            border-radius: 30px;
            width: 70px;
            height: 70px;
            background: pink;
        }
    }
}